<?php
/**
 * crcl/base
 *
 * Copyright 2013 CRCL - André Sabosch - info@crcl.de
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace crcl\base\template\instructions;

interface IIf
{
}

class ContainerIf extends Base implements IIf, IConcrete
{
  public function execute()
  {
    $var = $this->getAttribute('if');
    $var = \substr($var, 1); //remove trailing $

    $sOutput = '<?php if ($oValues->get(\'' . $var . '\') ';
    if ($this->hasAttribute('equals'))
    {
      $sEquals = $this->getAttribute('equals');
      if ($sEquals{0} !== '$')
      {
        $sOutput .= '== \''. $sEquals .'\') { ?>';
      }
      else
      {
        $sEquals = \substr($sEquals, 1); //remove trailing $
        $sOutput .= '== $oValues->get(\'' . $sEquals . '\')) { ?>';
      }
    }
    else
    {
      $sOutput .= '== \TRUE) { ?>';
    }

    if ($this->hasAttribute('scope'))
    {
      if ($this->getAttribute('scope') == 'attribute')
      {
        $this->sScope = \crcl\base\template\Instruction::SCOPE_ATTRIBUTE;

        $aAttributes = array();
        foreach ($this->aAttributes as $sAttribute => $value)
        {
          if (\strpos($sAttribute, 'attribute:') === 0)
          {
            if (\strlen($sAttribute) == 10) //10 = length attribute:
            {
              throw new Exception('Missing attribute',
                Exception::ERROR_IF_ATTRIBUTEEXPECTED,
                array('sAttribute' => $sAttribute));
            }
            $aAttributes[\substr($sAttribute, 10)] = $sOutput . $value . '<?php } ?>';
          }
        }
        $this->aAttributesTriggered = $aAttributes;
      }
    }
    else
    {
      $this->sOutput = $sOutput;
      $this->sOutputTriggered = '<?php } ?>';
      $this->sScope = \crcl\base\template\Instruction::SCOPE_NEXT;
    }
  }

  /** PRIVATE *************************************************************************************/

  protected $aAllowedAttributes = array('if', 'equals', 'scope', 'attribute');
}